If you need to drain an air receiver or other similar pressure
vessel the best choice is a ball valve drain. Compared to other
types of drain valves, ball valve drains are not affected as
quickly by dirt, oily sludge, rust, and the other gunk that comes
out of receiver tanks. Motorized ball valve drains with timers are
a little more expensive than direct acting drains, however the
headaches saved probably make the expense worthwhile.

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